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Interest and Other Expenses (Income), Net - Schedule of Interest and Other Expenses (Income), Net (Parenthetical) (Details) - USD ($) $ in Millions |  | 9 Months Ended
--- | --- | ---
Apr. 03, 2019 | Sep. 30, 2020 | Sep. 30, 2019
Manpower Switzerland | Interest and Other Expenses (Income), Net |  |  |
Other Non Operating Income Expense [Line Items] |  |  |
Non-cash gain on disposition of previously held equity interest | $ 80.4 |  | $ 80.4
United States Plans |  |  |
Other Non Operating Income Expense [Line Items] |  |  |
Pension settlement loss |  | $ (10.2) |

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